4g63 hands down. I have had mine for 3yrs now and have never had it brake down on me. It has had many setups including joes old setup but with nitrous and it still to this day has the balance shafts and stock head gasket. Plus i love the fact that its AWD and doesnt require a motor swap. Not to mention i just love the way they drive. Its realy hard to beat the bang for the buck of a AWD DSM.